CN110527922A - A kind of full bainite structure plastic die steel of self tempering and preparation method thereof - Google Patents
A kind of full bainite structure plastic die steel of self tempering and preparation method thereof Download PDFInfo
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- CN110527922A CN110527922A CN201910993655.6A CN201910993655A CN110527922A CN 110527922 A CN110527922 A CN 110527922A CN 201910993655 A CN201910993655 A CN 201910993655A CN 110527922 A CN110527922 A CN 110527922A
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- steel
- bainite structure
- plastic die
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- die steel
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
The invention discloses full bainite structure plastic die steels of a kind of self tempering and preparation method thereof, are related to iron and steel technical field, ingredient percent are as follows: C:0.20-0.35%, Si:0.25-0.45%, Mn:0.50-0.8%, Cr:1.4-2.0%, Mo:0.15-0.25%, Ti:0.020-0.035%, B:0.0015-0.0030%, Alt:0.02-0.04%, S :≤0.003%, P :≤0.015%, H :≤0.0003%, N :≤0.005%, surplus is Fe and inevitable impurity.The present invention is not added with the expensive alloying elements such as Ni and Zr, by being optimized to set up meter separately, the rationally additional amount of the alloying elements such as control Si, Mn, Cr, Alt, it acts synergistically to make each element cooperate, a kind of plastic die steel of the good mechanical performances such as intensity and toughness is finally obtained, production cost is significantly reduced, there is good economy.
Description
Technical field
The present invention relates to iron and steel technical field, the full bainite structure plastic die steel of especially a kind of self tempering and its preparation
Method.
Background technique
With popularization and application of the plastic products in industry and daily life, demand of the plastic mould industry to mould steel
It is increasing.In plastics processing, the quality of mold is self-evident to the guarantee effect of product quality.Plastic mould
Develop to the direction of precise treatment, enlargement and multi-cavity, the requirement to the performance of plastic die steel is higher and higher.Traditional tune
For matter plastic die steel due to quenching to be passed through and tempering, inside can generate very big internal stress, and biggish for section
For plastic die steel, the influence of this internal stress is quite huge, and non-quenching and tempering plastic mold steel is relatively small due to its
Internal stress, by more extensive concern.
A kind of low-carbon is disclosed application No. is 201210419491.4 Chinese patent to exempt to be tempered full bainite structure plastics
Mould steel and preparation method thereof, ingredient percent are as follows: C:0.10-0.20%, Si:0.25-0.45%, Mn:1.20-
1.70%；Ni:0.40-0.65%, Cr:1.8-2.2%, Mo:0.15-0.25%, Ti:0.02-0.035%, B:0.0020-
0.0030%, Zr:0.01-0.03%, S :≤0.01%, P :≤0.01%, O :≤0.01%, N≤0.005%, surplus are Fe and can not
Avoid impurity.The invention is a little: realizing the Micro Alloying processing of plastic die steel, and does not need to carry out height after cooling
Warm tempering, less process, reduces costs, and shortens the production cycle.
But there is following deficiency in the program: first, although the program does not need high tempering processing, but be added to Ni
With the expensive alloying elements such as Zr, while using low C ingredient and designing, therefore the manufacturing cost of plastic die steel is still higher；Its
Two, the program is only applicable to the steel plate that single mold casting production thickness specification is 500mm-800mm, and production efficiency is low, and is not suitable for
It produces, has some limitations in the industrialization continuous casting mode of scale.
Summary of the invention
The present invention provides a kind of full bainite structure plastic die steel of self tempering and preparation method thereof, and main purpose is
It solves the above problems.
The present invention adopts the following technical scheme:
A kind of full bainite structure plastic die steel of self tempering, ingredient percent are as follows: C:0.20-0.35%, Si:0.25-
0.45%, Mn:0.50-0.8%, Cr:1.4-2.0%, Mo:0.15-0.25%, Ti:0.020-0.035%, B:0.0015-
0.0030%, Alt:0.02-0.04%, S :≤0.003%, P :≤0.015%, H :≤0.0003%, N :≤0.005%, surplus Fe.
A kind of preparation method of such as above-mentioned full bainite structure plastic die steel of self tempering, includes the following steps:
(1) it is smelted by predetermined ingredient, is casting continuously to form steel billet；
(2) hot rolling, start rolling temperature >=1080 DEG C, using the big pressure of hot rolling after the heated stove heating of steel billet, will be carried out on milling train
Mode, single pass rolling reduction >=10%, 800-900 DEG C of finishing temperature.
(3) steel plate after hot rolling is air-cooled to 350-500 DEG C of surface, and stacking slow cooling 48 hours, it is subsequent to no longer need to carry out
Tempering heat treatment can be obtained the steel plate of full bainite structure.
Further, above-mentioned steel plate with a thickness of 20-60mm.
Further, the hardness range of above-mentioned steel plate is 30-35HRC.
Further, the hardness fluctuations range between each steel plate is lower than 2HRC.
Further, the milling train is 3000mm wide heavy and medium plate mill.
The design reason of present component is as follows:
C:C is the essential element for improving the hardness and wearability of steel, and solid solution strengthening effect is significant, is to guarantee energy under Micro Alloying state
The essential element of hardness can be reached by enough reaching pre-hardened plastic mold steel, but C content is excessively high, reduced bainite and turned
Temperature is unfavorable for the formation of bainite.Comprehensively consider, C content range of choice of the present invention is 0.20-0.35%.
Si:Si has preferable deoxidation effect, and in steelmaking process plus silicon is as reducing agent and deoxidier, can effectively press down
The precipitation of carbide processed, but it is excessively high, reduce the welding performance and welding performance of steel.Comprehensively consider, Si content of the present invention selects model
It encloses for 0.25-0.45%%.
Mn:Mn can postpone perlitic transformation strongly, be conducive to bainite and formed, but too high levels may make grain coarsening,
Weaken the resistance to corrosion of steel, reduces welding performance.Although and the increase of Mn content can propose harden ability, be easily segregated, be unfavorable for
The structural homogenity of steel.Comprehensively consider, Mn content range of choice of the present invention is 0.50-0.8%.
Cr:Cr is strong postponement pearlite and ferritic transformation element, is conducive to bainite and forms and improve intensity, chromium carbon
Compound is most tiny one kind, it is evenly distributed in steel body product, so having high intensity, hardness, yield point and height
Wearability.Cr can reduce decarbonization.But plasticity and toughness are reduced simultaneously, Cr too high levels can also be easily reduced bainite and turn
Temperature.Comprehensively consider, Cr content range of choice of the present invention is 1.4-2.0%.
Mo:Mo can strong inhibition perlitic transformation, can reduce the overheat tendentiousness of steel, improve intensity and hardness, and refine
Crystal grain improves toughness, makes to forge handling ease.Meanwhile Mo is ferrite former, iron just easily occurs when Mo content is more
Ferritic δ phase or other brittlement phases and reduce toughness.Comprehensively consider, Mo content range of choice of the present invention is 0.15-0.25%.
Ti:Ti is added mainly as solid N element, while also functioning to the effect of deoxidation, to improve the content of effective boron.It is comprehensive
It closes and considers.Ti content range of choice of the present invention is 0.020-0.035%.
B: micro B can significantly improve the harden ability of steel, strongly postponement ferritic transformation, maximally efficient to middle low carbon steel,
But when B content is more than 0.0035%, the effect of harden ability is urged to start to reduce, and easily cause brittleness.Comprehensively consider, B of the present invention
Content range of choice is 0.0015-0.0030%.
Alt: the addition of Al then will form dissolved aluminum (Als) and Soluble aluminium in steel, and Als includes being dissolved aluminium and AlN, more
Scattered AlN particle can prevent growing up for austenite grain, refine crystal grain.The range of choice of Alt content of the present invention is 0.02-
0.04%。
P, S: facilitate the improvement of machinability.If content excessively will lead to macrosegregation, the homogeneous of steel is influenced
Property and degree of purity, comprehensively consider, the present invention in P≤0.015%, S≤0.003%.
H: suitable H element can promote decarburization, but H content is excessively high to will lead to the subsequent hydrogen-induced delayed cracking phenomenon of steel,
Comprehensively consider, H≤0.0003% in the present invention.
N:N can be improved the surface hardness and wearability of steel, but N content it is excessively high can with alloying element stroke nitride, from
And alloys producing is reduced, comprehensively consider, N≤0.005% in the present invention.
Compared to the prior art, the beneficial effect that the present invention generates is:
1, the present invention is not added with the expensive alloying elements such as Ni and Zr, sets up meter separately by being optimized to, and rationally controls Si, Mn, Cr, Alt
The additional amount of equal alloying elements has finally obtained the power such as a kind of intensity and toughness so that each element be made to cooperate synergistic effect
The plastic die steel for learning function admirable, significantly reduces production cost, has good economy.
2, the Micro Alloying processing of the achievable plastic die steel of the present invention, and do not need to carry out at high tempering after cooling
Reason, reduces process, reduces costs, and shortens the production cycle, and preparation method is simple, strong operability, have it is at low cost,
Plate shape is good and steady performance, the batch type for being applicable to large scale industry produce.
Detailed description of the invention
Fig. 1 is the bainite structure photo on one light plate surface layer of embodiment.
Fig. 2 is the bainite structure photo of one light plate center portion of embodiment.
Fig. 3 is the bainite structure photo on two light plate surface layer of embodiment.
Fig. 4 is the bainite structure photo of two light plate center portion of embodiment.
Specific embodiment
Illustrate a specific embodiment of the invention with reference to the accompanying drawings.In order to fully understand the present invention, it is described below and is permitted
More details, but to those skilled in the art, the present invention can also be realized without these details.
Embodiment one:
The full bainite structure plastic die steel of the present embodiment by mass percentage be designed to be divided into: C:0.27%, Si:
0.43%, Mn:0.79%, Cr:1.62%, Mo:0.19%, Ti:0.025%, B:0.0017%, Alt:0.032%, S:0.0017%, P:
0.0013%, H:0.00024%, N:0.004%, remaining is Fe and inevitable impurity.
Converter smelting is used by the above ingredient, is casting continuously to form 220*1600mm steel billet, and heated in heating furnace, heating temperature
1220 DEG C of degree；Rolled using hot rolling technology, 1120 DEG C of start rolling temperature, single pass rolling reduction 12%, steel plate with a thickness of
31mm, 880 DEG C of finishing temperature；It is stacking slow cooling 48 hours or more, final hard after steel plate after hot rolling is air-cooled to 350 DEG C of surface
The steel plate of range 32-34HRC is spent, microscopic structure is full bainite structure, is seen figure 1 and figure 2 in detail.
Embodiment two:
The full bainite structure plastic die steel of the present embodiment by mass percentage be designed to be divided into: C:0.29%, Si:
0.44%, Mn:0.79%, Cr:1.64%, Mo:0.20%, Ti:0.020%, B:0.0017%, Alt:0.035%, S:0.001%, P:
0.0015%, H:0.00021%, N:0.0032%, remaining is Fe and inevitable impurity.
Converter smelting is used by the above ingredient, is casting continuously to form 220*1600mm steel billet, and heated in heating furnace, heating temperature
1240 DEG C of degree；Rolled using hot rolling technology, 1180 DEG C of start rolling temperature, single pass rolling reduction 11%, steel plate with a thickness of
46mm, 860 DEG C of finishing temperature；By the steel plate after hot rolling be air-cooled to surface temperature be 450 DEG C after, stacking slow cooling 48 hours or more,
The steel plate of final hardness range 30-32HRC, microscopic structure are full bainite structure, in detail as shown in figure 3 and figure 4.
The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, all to utilize this
Design makes a non-material change to the present invention, and should all belong to behavior that violates the scope of protection of the present invention.
Claims (6)
1. a kind of full bainite structure plastic die steel of self tempering, it is characterised in that: its ingredient percent are as follows: C:0.20-
0.35%, Si:0.25-0.45%, Mn:0.50-0.8%, Cr:1.4-2.0%, Mo:0.15-0.25%, Ti:0.020-0.035%, B:
0.0015-0.0030%, Alt:0.02-0.04%, S :≤0.003%, P :≤0.015%, H :≤0.0003%, N :≤0.005%, it is remaining
Amount is Fe and inevitable impurity.
2. a kind of preparation method of the full bainite structure plastic die steel of self tempering as described in claim 1, it is characterised in that:
Include the following steps:
(1) it is smelted by predetermined ingredient, is casting continuously to form steel billet；
(2) hot rolling, start rolling temperature >=1080 DEG C, using the big pressure of hot rolling after the heated stove heating of steel billet, will be carried out on milling train
Mode, single pass rolling reduction >=10%, 800-900 DEG C of finishing temperature.
(3) steel plate after hot rolling is air-cooled to 350-500 DEG C of surface, and stacking slow cooling 48 hours, it is subsequent to no longer need to be tempered
Heat treatment, can be obtained the steel plate of full bainite structure.
3. a kind of preparation method of the full bainite structure plastic die steel of self tempering as claimed in claim 2, it is characterised in that:
The steel plate with a thickness of 20-60mm.
4. a kind of preparation method of the full bainite structure plastic die steel of self tempering as claimed in claim 2, it is characterised in that:
The hardness range of the steel plate is 30-35HRC.
5. a kind of preparation method of the full bainite structure plastic die steel of self tempering as claimed in claim 2, it is characterised in that:
Hardness fluctuations range between each steel plate is lower than 2HRC.
6. a kind of preparation method of the full bainite structure plastic die steel of self tempering as claimed in claim 2, it is characterised in that:
The milling train is 3000mm wide heavy and medium plate mill.
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| CN201910993655.6A CN110527922A (en) | 2019-10-18 | 2019-10-18 | A kind of full bainite structure plastic die steel of self tempering and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118403A (en) * | 2020-03-06 | 2020-05-08 | 马鞍山钢铁股份有限公司 | Ti microalloyed high-strength high-toughness bainite non-quenched and tempered steel and forging and cooling control process and production process thereof |
| CN113373380A (en) * | 2021-06-30 | 2021-09-10 | 宝武集团鄂城钢铁有限公司 | Zirconium-treated economical plastic die steel and production method thereof |
| CN113528980A (en) * | 2021-07-19 | 2021-10-22 | 江苏省沙钢钢铁研究院有限公司 | Die steel plate and production method thereof |
| CN113621885A (en) * | 2021-08-18 | 2021-11-09 | 宝武集团鄂城钢铁有限公司 | Boron-treated pre-hardened plastic mold super-thick steel plate and production method thereof |
| CN114535944A (en) * | 2021-12-15 | 2022-05-27 | 河北工业职业技术学院 | Short-process bainite hot working die and preparation method thereof |
| WO2023272873A1 (en) * | 2021-06-30 | 2023-01-05 | 江苏省沙钢钢铁研究院有限公司 | Plastic mold steel plate and production method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118403A (en) * | 2020-03-06 | 2020-05-08 | 马鞍山钢铁股份有限公司 | Ti microalloyed high-strength high-toughness bainite non-quenched and tempered steel and forging and cooling control process and production process thereof |
| CN111118403B (en) * | 2020-03-06 | 2020-11-03 | 马鞍山钢铁股份有限公司 | Ti microalloyed high-strength high-toughness bainite non-quenched and tempered steel and forging and cooling control process and production process thereof |
| CN113373380A (en) * | 2021-06-30 | 2021-09-10 | 宝武集团鄂城钢铁有限公司 | Zirconium-treated economical plastic die steel and production method thereof |
| WO2023272873A1 (en) * | 2021-06-30 | 2023-01-05 | 江苏省沙钢钢铁研究院有限公司 | Plastic mold steel plate and production method therefor |
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| CN113621885A (en) * | 2021-08-18 | 2021-11-09 | 宝武集团鄂城钢铁有限公司 | Boron-treated pre-hardened plastic mold super-thick steel plate and production method thereof |
| CN113621885B (en) * | 2021-08-18 | 2022-02-22 | 宝武集团鄂城钢铁有限公司 | Boron-treated pre-hardened plastic mold super-thick steel plate and production method thereof |
| CN114535944A (en) * | 2021-12-15 | 2022-05-27 | 河北工业职业技术学院 | Short-process bainite hot working die and preparation method thereof |
| CN114535944B (en) * | 2021-12-15 | 2022-11-29 | 河北工业职业技术学院 | Short-process bainite hot working die and preparation method thereof |
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